Oxygen.
The gas is carbon dioxide.
dephlogisticated muriatic acid
use your brain
No one knows
it isnt easy its boring
Joseph Priestly discovered "oxygen" in 1744. He called it "dephlogisticated air."
dephlogisticated air is oxygen gas; - so called by Dr. Priestly and others of his time.
Joseph Priestley was the man who first discovered oxygen, or as he called it "dephlogisticated air", back in the 18th Century
In 1809 Joseph Louis Gay-Lussac and Louis-Jacques Thénard tried to decompose dephlogisticated muratic acid air by reacting it with charcoal to release the free element muriaticum (and carbon dioxide). They did not succeed and published a report in which they considered the possibility that dephlogisticated muratic acid air is an element, but were not convinced. In 1810, Sir Humphrey Davy tried the same experiment again, and concluded that it was an element, and not a compound. He named this new element as chlorine, from the Greek word χλωρος (chlōros), meaning green-yellow
In 1809 Joseph Louis Gay-Lussac and Louis-Jacques Thénard tried to decompose dephlogisticated muratic acid air by reacting it with charcoal to release the free element muriaticum (and carbon dioxide). They did not succeed and published a report in which they considered the possibility that dephlogisticated muratic acid air is an element, but were not convinced. In 1810, Sir Humphrey Davy tried the same experiment again, and concluded that it was an element, and not a compound. He named this new element as chlorine, from the Greek word χλωρος (chlōros), meaning green-yellow
The history is actually quite interesting. I'd like to suggest a book to you. Read The Last Sorcerers: The Path from Alchemy to the Periodic Table by Richard Morris. It gives you the entire history...and explains it better than I ever could within a short response.